docs: def check(path=None, env='default'):
      """
      Execute the checks: rules for a given build.yml file.
      """
      # TODO: add files=<list of files> to check only a subset...
      # also useful for 'quilt build' to exclude certain files?
      # (if not, then require dry_run=True if files!=None/all)
      build("dry_run/dry_run", path=path, dry_run=True, env=env)